Polyamide-6 polymerization and its melt flow in the VK tube reactor with optimized baffle structure

Tang, Zuwu; Wang, X.-Q.; Hung, Nguyen Xuan; Gerking, L.

doi:10.1002/(sici)1522-9505(19990501)266:1<7::aid-apmc7>3.3.co;2-7

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“…There are two common industrial routes to manufacture the polymer from the monomer ϵ‐caprolactam. The first one is called hydrolytic polymerization and is usually performed on a large scale,1, 2 and the second route is through the ionic chain‐growth mechanism . In the process of the hydrolytic polymerization of ϵ‐caprolactam, different amounts of molecular weight (MW) regulators need to be present in the reaction system to provide a series of products fulfilling the requirements designated for various ultimate performances.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of polyamide‐6 with three‐branched chains

Dai

Huang

Tang

et al. 2001

J of Applied Polymer Sci

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ABSTRACT:With trimesinic acid as a molecular weight regulator, the hydrolytic polymerization of ⑀-caprolactam was carried out, and nylon-6 or polyamide-6 with threebranched chains was obtained. Through a systematic study of the effects of conditions such as the reaction time and concentration of trimesinic acid on the polymerization, we found that the conversion of caprolactam was almost insensitive to the initial concentrations of the regulators, but the relative viscosity of the polymer decreased with increasing trimesinic acid. Characterization investigations showed that differential scanning calorimetry curves changed from a single peak for normal nylon-6 to one main peak and one shoulder or one small peak for the branched polymer; the melting point of the star-shaped nylon-6 decreased with an increasing amount of trimesinic acid, whereas its crystallization temperature was higher than that of linear-chain nylon-6. A wide-angle X-ray diffraction study indicated that the crystal structure of the starshaped nylon-6 still belonged to the ␣ form, and the crystallizability of the branched polymer with an elevated amount of trimesinic acid during polymerization did not seem to be weakened; the characteristic absorption of infrared spectra provided indirect evidence for the existence of branched chains in the polymer. Moreover, the mechanical properties of star-shaped nylon-6 and linear-chain nylon-6 were compared.

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Section: Introductionmentioning

confidence: 99%